feat: complete readme.md file

readme.md

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+# slack bot notifier
+
+This repository contain go application deploy into kubernetes job batch with cron.
+Each run application run some cli check and assert condition on cli stdout. If assertion failed
+a notification is send to slack channel.
+
+## local build
+
+`make build`
+
+## docker build and deploy
+
+```
+make docker-build
+
+cd manifests/
+terraform init
+terraform apply --auto-approve
+```